An Official Security Patch for Version 6.1.2 has been released.
This update/patch addresses several security issues. Anyone running Dolphin 6.1.2 should apply this.
If you have just downloaded the latest version 6.1.3 the official statement is you will not need any further patching or updating at the time of this posting July 17, 2008. But you should certainly follow up and read the official blog statement.
Please see this Unity blog post for more details:
Official Dolphin Patch Information and Update
And download the official patch and instructions from here:
6.1.2 to 6.1.3 Official Security Patch
If you are installing a fresh new version and your download is 6.1.3 no further patching or updates are needed. Please see the above links for more details or any concerns.